One vertex per element, one color per generator, with an edge from x to x·s.
(3,7)(5,8)(11,17)(15,18)(19,23)(22,24)(25,26,30,28)(27,32,35,31)(29,33,37,36)(34,39,40,38)(1,2,4,6)(3,5,7,8)(9,10,13,14)(11,15,17,18)(12,16,20,21)(19,22,23,24)(25,27,30,35)(26,31,28,32)(29,34,37,40)(33,38,36,39)(1,3)(2,5)(4,7)(6,8)(10,14)(12,20)(15,18)(19,23)(25,26,30,28)(27,31,35,32)(29,36,37,33)(34,39,40,38)(9,11,13,17)(10,15,14,18)(12,19,20,23)(16,22,21,24)(25,28,30,26)(27,32,35,31)(29,36,37,33)(34,39,40,38)(1,2)(3,5)(4,6)(7,8)(9,10)(11,18)(12,16)(13,14)(15,17)(19,24)(20,21)(22,23)(25,27)(26,32)(28,31)(29,34)(30,35)(33,39)(36,38)(37,40) involution — undirected(1,3)(2,5)(4,7)(6,8)(9,12)(10,16)(11,19)(13,20)(14,21)(15,22)(17,23)(18,24)(25,29,30,37)(26,33,28,36)(27,34,35,40)(31,38,32,39)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.